INTRODUCTION
WORK BREAKDOWN STRUCTURE
Ferdinand Fassa
Outline
1. Review Lecture 5
2. What is a Work Breakdown Structure?
3. Why is a Work Breakdown Structure needed?
4. Preparing a WBS
5. Building a WBS: Structure
What is a Work Breakdown Structure?
The Work Breakdown Structure (WBS) is
•
A tool that defines A project is breakdown into A group of
activities.
•
A representation of the detailed project scope statement that
What is a Work Breakdown Structure?
A WBS element may be:
•
A product,
•
Data,
•
A service, or
Why is a Work Breakdown Structure needed?
Not all projects have a WBS,
So why is a WBS needed?
–
Provides a framework for organizing and managing the
approved project scope
–
Helps ensure you have defined all the work that makes up
the project
–
Provides a framework for planning and controlling cost and
schedule information
Preparing a WBS
In preparing a WBS there are a number of steps that need to be taken
including:
1.
identifying the final project product
2.
Divide the total work of the project into major groups
3.
Subdivide these groups into tasks
4.
Divide these tasks into sub-tasks
5.
Subtasks should be small enough to permit adequate control and
Chapter 5 Planning 8
Example of WBS: “Holiday”
holiday
travel documents
passport tickets
insurance
booking
choose
resort confirm
brochures
household
9
List of activities
•
Booking:
•
get brochures
•
choose resort
•
make booking
•
confirm booking
•
Travel documents:
•
check passport
•
book tickets
•
get insurance
•
Household:
10
• Redecorate Room
– Prepare materials
• Buy paint
• Buy a ladder
• Buy brushes/rollers
• Buy wallpaper remover
– Prepare room
• Remove old wallpaper
• Remove detachable decorations
• Cover floor with old newspapers
• Cover electrical outlets/switches with tape
• Cover furniture with sheets
– Paint the room
– Clean up the room
• Dispose or store left over paint
• Clean brushes/rollers
• Dispose of old newspapers
• Remove covers
Building a WBS: Structure
The ACME Housing Corporation, which you own, has been contracted to build its first house.
Start the WBS with ACME in the highest position, or Level 1. Accordingly, Level 1 is given a WBS code of 1. You assign the WBS code of 1 to the highest level because all future projects (houses) will be summarized at Level 1.
Level 1 NOTE: For ease of explanation, our
example will assume the following:
• Design is complete
• All permits issued
• All Material ordered
WBS: Structure
With Level 1 established, you can begin to complete the WBS.
Level 2 is identified at the project level: House.
Appropriately, the code for Level 2 corresponds to Level 1. In this case,
the code is 1.1.
Level 1
WBS: Structure
You choose to divide Level 3 into six elements: concrete, framing, plumbing, electrical, interior and roofing.
Notice the WBS codes at level 3. Each is unique to the project and starts with the WBS code from the level above (11.11.1.1). Now lets look and see if another level is needed.
Level 1
Level 2
WBS: Structure
Level 4 Level 3
Level 1
Level 2
Work Breakdown Structure (WBS) Tree
• The graphical structure of the WBS is an easy way to identify the project
components and relationships of those components.
• WBS can be displayed in another format as well: the Tree format. Both formats are acceptable.
• Note the WBS codes and the structure of the Levels in the Tree format mirror the graphical format. The content has not changed; only the way the content is presented has changed.
1 ACME Housing Corporation
1.1 New Home Construction
1.1.1 Concrete
1.1.1.1 Pour Foundation 1.1.1.2 Install Patio 1.1.1.3 Pour Stairway
1.1.2 Framing
1.1.2.1 Frame Exterior Walls 1.1.2.2 Frame Interior Walls 1.1.2.3 Install Roofing Trusses
1.1.3 Plumbing
1.1.3.1 Install Water Lines 1.1.3.2 Install Gas Lines 1.1.3.3 Install B/K Fixtures
1.1.4 Electrical
1.1.4.1 Install Wiring
1.1.4.2 Install Outlets/Switches 1.1.4.3 Install Fixtures
1.1.5 Interior
1.1.5.1 Install Drywall 1.1.5.2 Install Carpets 1.1.5.3 Install Painting
1.1.6 Roofing
Organization Breakdown Structure (OBS)
After WBS is developed:
• Resources and responsibilities need to assigned.
• The first step in doing this is developing the Organizational Breakdown Structure (OBS) for the project.
• The OBS indicates the organizational relationships and is used as the framework for assigning work responsibilities.
CONCRETE PERF DEPT 6010
M. Manning MASONRY PERF DEPT 6020
T. Greams TEST PERF DEPT 6030
K. Neumann CIVIL RESP DEPT
R. Kelly
CARPENTRY PERF DEPT 5010
R. Sites ROOFING PERF DEPT 5020
Y. Taylor DRYWALL PERF DEPT 5030
D. Smith STRUCTURAL
RESP DEPT P. Tate
PERF DEPT 4010 S. Johnson HOOKUP/TIE-IN PERF DEPT 4020
P. Ottis ELECTICAL RESP DEPT
J. Sims
WATER/SEWER PERF DEPT 3010
K. Wells GAS PERF DEPT 3020
R. Oriely PLUMBING RESP DEPT
R. Lee PROJECT OFFICE
RESP DEPT B. Smithers
Conclusion
WBS is a tool that defines a project and groups the projects elements
in a way that helps organize and define the total work scope of the
project
In preparing a WBS there are a number of steps that need to be
taken including:
1. identifying the final project product
2. Divide the total work of the project into major groups
3. Subdivide these groups into tasks
4. Divide these tasks into sub-tasks
